9a9a760829
https://sourceware.org/ml/gdb-patches/2014-05/msg00383.html The MI command -var-info-path-expression currently does not handle non-anonymous structs / unions nested within other structs / unions, it will skip parts of the expression. Consider this example: ## START EXAMPLE ## $ cat ex.c #include <string.h> int main () { struct s1 { int a; }; struct ss { struct s1 x; }; struct ss an_ss; memset (&an_ss, 0, sizeof (an_ss)); return 0; } $ gcc -g -o ex.x ex.c $ gdb ex.x (gdb) break 18 Breakpoint 1 at 0x80483ba: file ex.c, line 18. (gdb) run Starting program: /home/user/ex.x Breakpoint 1, main () at ex.c:18 18 return 0; (gdb) interpreter-exec mi "-var-create an_ss * an_ss" (gdb) interpreter-exec mi "-var-list-children an_ss" ^done,numchild="1",children=[child={name="an_ss.x",exp="x",numchild="1",type="struct s1",thread-id="1"}],has_more="0" (gdb) interpreter-exec mi "-var-list-children an_ss.x" ^done,numchild="1",children=[child={name="an_ss.x.a",exp="a",numchild="0",type="int",thread-id="1"}],has_more="0" (gdb) interpreter-exec mi "-var-list-children an_ss.x.a" ^done,numchild="0",has_more="0" (gdb) interpreter-exec mi "-var-info-path-expression an_ss.x.a" ^done,path_expr="(an_ss).a" (gdb) print (an_ss).a There is no member named a. ## END EXAMPLE ## Notice that the path expression returned is wrong, and as a result the print command fails. This patch adds a new method to the varobj_ops structure called is_path_expr_parent, to allow language specific control over finding the parent varobj, the current logic becomes the C/C++ version and is extended to handle the nested cases. No other language currently uses this code, so all other languages just get a default method. With this patch, the above example now finishes like this: ## START EXAMPLE ## $ gdb ex.x (gdb) break 18 Breakpoint 1 at 0x80483ba: file ex.c, line 18. (gdb) run Starting program: /home/user/ex.x Breakpoint 1, main () at ex.c:18 18 return 0; (gdb) interpreter-exec mi "-var-list-children an_ss" ^done,numchild="1",children=[child={name="an_ss.x",exp="x",numchild="1",type="struct s1",thread-id="1"}],has_more="0" (gdb) interpreter-exec mi "-var-list-children an_ss.x" ^done,numchild="1",children=[child={name="an_ss.x.a",exp="a",numchild="0",type="int",thread-id="1"}],has_more="0" (gdb) interpreter-exec mi "-var-list-children an_ss.x.a" ^done,numchild="0",has_more="0" (gdb) interpreter-exec mi "-var-info-path-expression an_ss.x.a" ^done,path_expr="((an_ss).x).a" (gdb) print ((an_ss).x).a $1 = 0 ## END EXAMPLE ## Notice that the path expression is now correct, and the print is a success. gdb/ChangeLog: * ada-varobj.c (ada_varobj_ops): Fill in is_path_expr_parent field. * c-varobj.c (c_is_path_expr_parent): New function, moved core from varobj.c, with additional checks. (c_varobj_ops): Fill in is_path_expr_parent field. (cplus_varobj_ops): Fill in is_path_expr_parent field. * jv-varobj.c (java_varobj_ops): Fill in is_path_expr_parent field. * varobj.c (is_path_expr_parent): Call is_path_expr_parent varobj ops method. (varobj_default_is_path_expr_parent): New function. * varobj.h (lang_varobj_ops): Add is_path_expr_parent field. (varobj_default_is_path_expr_parent): Declare new function. gdb/testsuite/ChangeLog: * gdb.mi/var-cmd.c (do_nested_struct_union_tests): New function setting up test structures. (main): Call new test function. * gdb.mi/mi2-var-child.exp: Create additional breakpoint in new test function, continue into test function and walk test structures.
637 lines
13 KiB
C
637 lines
13 KiB
C
/* Copyright 1999-2014 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <stdlib.h>
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#include <string.h>
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struct _simple_struct {
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int integer;
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unsigned int unsigned_integer;
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char character;
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signed char signed_character;
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char *char_ptr;
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int array_of_10[10];
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};
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typedef struct _simple_struct simpleton;
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simpleton global_simple;
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enum foo {
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bar = 1,
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baz
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};
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typedef enum foo efoo;
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union named_union
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{
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int integer;
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char *char_ptr;
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};
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typedef struct _struct_decl {
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int integer;
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char character;
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char *char_ptr;
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long long_int;
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int **int_ptr_ptr;
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long long_array[10];
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void (*func_ptr) (void);
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struct _struct_decl (*func_ptr_struct) (int, char *, long);
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struct _struct_decl *(*func_ptr_ptr) (int, char *, long);
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union {
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int a;
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char *b;
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long c;
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enum foo d;
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} u1;
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struct {
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union {
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struct {
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int d;
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char e[10];
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int *(*func) (void);
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efoo foo;
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} u1s1;
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long f;
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struct {
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char array_ptr[2];
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int (*func) (int, char *);
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} u1s2;
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} u2;
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int g;
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char h;
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long i[10];
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} s2;
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} weird_struct;
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struct _struct_n_pointer {
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char ****char_ptr;
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long ****long_ptr;
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struct _struct_n_pointer *ptrs[3];
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struct _struct_n_pointer *next;
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};
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struct anonymous {
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int a;
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struct {
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int b;
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char *c;
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union {
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int d;
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void *e;
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char f;
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struct {
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char g;
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const char **h;
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simpleton ***simple;
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};
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};
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};
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};
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void do_locals_tests (void);
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void do_block_tests (void);
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void subroutine1 (int, long *);
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void nothing (void);
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void do_children_tests (void);
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void do_special_tests (void);
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void incr_a (char);
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void incr_a (char a)
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{
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int b;
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b = a;
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}
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int array[] = {1,2,3};
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int array2[] = {4,5,6};
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int *array_ptr = array;
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void
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do_locals_tests ()
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{
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int linteger = 0;
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int *lpinteger = 0;
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char lcharacter[2] = { 0, 0 };
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char *lpcharacter = 0;
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long llong = 0;
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long *lplong = 0;
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float lfloat = 0;
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float *lpfloat = 0;
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double ldouble = 0;
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double *lpdouble = 0;
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struct _simple_struct lsimple = { 0 };
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struct _simple_struct *lpsimple = 0;
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void (*func) (void) = 0;
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/* Simple assignments */
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linteger = 1234;
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lpinteger = &linteger;
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lcharacter[0] = 'a';
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lpcharacter = lcharacter;
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llong = 2121L;
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lplong = &llong;
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lfloat = 2.1;
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lpfloat = &lfloat;
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ldouble = 2.718281828459045;
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lpdouble = &ldouble;
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lsimple.integer = 1234;
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lsimple.unsigned_integer = 255;
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lsimple.character = 'a';
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lsimple.signed_character = 21;
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lsimple.char_ptr = lcharacter;
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lpsimple = &lsimple;
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func = nothing;
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/* Check pointers */
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linteger = 4321;
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lcharacter[0] = 'b';
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llong = 1212L;
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lfloat = 1.2;
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ldouble = 5.498548281828172;
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lsimple.integer = 255;
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lsimple.unsigned_integer = 4321;
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lsimple.character = 'b';
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lsimple.signed_character = 0;
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subroutine1 (linteger, &llong);
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}
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void
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nothing ()
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{
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}
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void
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subroutine1 (int i, long *l)
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{
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global_simple.integer = i + 3;
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i = 212;
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*l = 12;
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}
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void
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do_block_tests ()
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{
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int cb = 12;
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{
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int foo;
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foo = 123;
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{
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int foo2;
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foo2 = 123;
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{
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int foo;
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foo = 321;
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}
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foo2 = 0;
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}
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foo = 0;
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}
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cb = 21;
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}
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void
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do_children_tests (void)
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{
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weird_struct *weird;
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struct _struct_n_pointer *psnp;
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struct _struct_n_pointer snp0, snp1, snp2;
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char a0[2] = {}, *a1, **a2, ***a3;
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char b0[2] = {}, *b1, **b2, ***b3;
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char c0[2] = {}, *c1, **c2, ***c3;
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long z0, *z1, **z2, ***z3;
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long y0, *y1, **y2, ***y3;
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long x0, *x1, **x2, ***x3;
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int *foo;
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int bar;
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/* Avoid pointing into NULL, as that is editable on some
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systems. */
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int dummy;
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int *dummy_ptr = &dummy;
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struct _struct_decl struct_declarations = { 0, 0, NULL, 0, &dummy_ptr };
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weird = &struct_declarations;
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struct_declarations.integer = 123;
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weird->char_ptr = "hello";
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bar = 2121;
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foo = &bar;
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struct_declarations.int_ptr_ptr = &foo;
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weird->long_array[0] = 1234;
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struct_declarations.long_array[1] = 2345;
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weird->long_array[2] = 3456;
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struct_declarations.long_array[3] = 4567;
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weird->long_array[4] = 5678;
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struct_declarations.long_array[5] = 6789;
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weird->long_array[6] = 7890;
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struct_declarations.long_array[7] = 8901;
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weird->long_array[8] = 9012;
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struct_declarations.long_array[9] = 1234;
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weird->func_ptr = nothing;
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/* Struct/pointer/array tests */
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a0[0] = '0';
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a1 = a0;
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a2 = &a1;
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a3 = &a2;
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b0[0] = '1';
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b1 = b0;
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b2 = &b1;
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b3 = &b2;
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c0[0] = '2';
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c1 = c0;
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c2 = &c1;
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c3 = &c2;
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z0 = 0xdead + 0;
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z1 = &z0;
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z2 = &z1;
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z3 = &z2;
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y0 = 0xdead + 1;
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y1 = &y0;
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y2 = &y1;
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y3 = &y2;
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x0 = 0xdead + 2;
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x1 = &x0;
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x2 = &x1;
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x3 = &x2;
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snp0.char_ptr = &a3;
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snp0.long_ptr = &z3;
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snp0.ptrs[0] = &snp0;
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snp0.ptrs[1] = &snp1;
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snp0.ptrs[2] = &snp2;
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snp0.next = &snp1;
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snp1.char_ptr = &b3;
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snp1.long_ptr = &y3;
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snp1.ptrs[0] = &snp0;
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snp1.ptrs[1] = &snp1;
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snp1.ptrs[2] = &snp2;
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snp1.next = &snp2;
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snp2.char_ptr = &c3;
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snp2.long_ptr = &x3;
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snp2.ptrs[0] = &snp0;
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snp2.ptrs[1] = &snp1;
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snp2.ptrs[2] = &snp2;
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snp2.next = 0x0;
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psnp = &snp0;
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snp0.char_ptr = &b3;
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snp1.char_ptr = &c3;
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snp2.char_ptr = &a3;
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snp0.long_ptr = &y3;
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snp1.long_ptr = &x3;
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snp2.long_ptr = &z3;
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{int a = 0;}
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}
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void
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do_special_tests (void)
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{
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union named_union u;
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union {
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int a;
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char b;
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long c;
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} anonu;
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struct _simple_struct s;
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struct {
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int a;
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char b;
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long c;
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} anons;
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enum foo e;
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enum { A, B, C } anone;
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int array[21];
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int a;
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a = 1;
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u.integer = a;
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anonu.a = a;
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s.integer = a;
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anons.a = a;
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e = bar;
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anone = A;
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incr_a(2);
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}
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void do_frozen_tests ()
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{
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/*: BEGIN: frozen :*/
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struct {
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int i;
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struct {
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int j;
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int k;
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} nested;
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} v1 = {1, {2, 3}};
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int v2 = 4;
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/*:
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mi_create_varobj V1 v1 "create varobj for v1"
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mi_create_varobj V2 v2 "create varobj for v2"
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mi_list_varobj_children "V1" {
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{"V1.i" "i" "0" "int"}
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{"V1.nested" "nested" "2" "struct {...}"}
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} "list children of v1"
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mi_list_varobj_children "V1.nested" {
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{"V1.nested.j" "j" "0" "int"}
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{"V1.nested.k" "k" "0" "int"}
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} "list children of v1.nested"
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mi_check_varobj_value V1.i 1 "check V1.i: 1"
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mi_check_varobj_value V1.nested.j 2 "check V1.nested.j: 2"
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mi_check_varobj_value V1.nested.k 3 "check V1.nested.k: 3"
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mi_check_varobj_value V2 4 "check V2: 4"
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:*/
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v2 = 5;
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/*:
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mi_varobj_update * {V2} "update varobjs: V2 changed"
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set_frozen V2 1
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:*/
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v2 = 6;
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/*:
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mi_varobj_update * {} "update varobjs: nothing changed"
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mi_check_varobj_value V2 5 "check V2: 5"
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mi_varobj_update V2 {V2} "update V2 explicitly"
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mi_check_varobj_value V2 6 "check V2: 6"
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:*/
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v1.i = 7;
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v1.nested.j = 8;
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v1.nested.k = 9;
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/*:
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set_frozen V1 1
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mi_varobj_update * {} "update varobjs: nothing changed"
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mi_check_varobj_value V1.i 1 "check V1.i: 1"
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mi_check_varobj_value V1.nested.j 2 "check V1.nested.j: 2"
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mi_check_varobj_value V1.nested.k 3 "check V1.nested.k: 3"
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# Check that explicit update for elements of structures
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# works.
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# Update v1.j
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mi_varobj_update V1.nested.j {V1.nested.j} "update V1.nested.j"
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mi_check_varobj_value V1.i 1 "check V1.i: 1"
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mi_check_varobj_value V1.nested.j 8 "check V1.nested.j: 8"
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mi_check_varobj_value V1.nested.k 3 "check V1.nested.k: 3"
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# Update v1.nested, check that children is updated.
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mi_varobj_update V1.nested {V1.nested.k} "update V1.nested"
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mi_check_varobj_value V1.i 1 "check V1.i: 1"
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mi_check_varobj_value V1.nested.j 8 "check V1.nested.j: 8"
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mi_check_varobj_value V1.nested.k 9 "check V1.nested.k: 9"
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# Update v1.i
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mi_varobj_update V1.i {V1.i} "update V1.i"
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mi_check_varobj_value V1.i 7 "check V1.i: 7"
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:*/
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v1.i = 10;
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v1.nested.j = 11;
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v1.nested.k = 12;
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/*:
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# Check that unfreeze itself does not updates the values.
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set_frozen V1 0
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mi_check_varobj_value V1.i 7 "check V1.i: 7"
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mi_check_varobj_value V1.nested.j 8 "check V1.nested.j: 8"
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mi_check_varobj_value V1.nested.k 9 "check V1.nested.k: 9"
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mi_varobj_update V1 {V1.i V1.nested.j V1.nested.k} "update V1"
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mi_check_varobj_value V1.i 10 "check V1.i: 10"
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mi_check_varobj_value V1.nested.j 11 "check V1.nested.j: 11"
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mi_check_varobj_value V1.nested.k 12 "check V1.nested.k: 12"
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:*/
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/*: END: frozen :*/
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}
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void do_at_tests_callee ()
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{
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/* This is a test of wrong DWARF data being assigned to expression.
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The DWARF location expression is bound to symbol when expression
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is parsed. So, if we create floating varobj in one function,
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and then try to reevaluate it in other frame without reparsing
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the expression, we will access local variables using DWARF
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location expression from the original frame, and are likely
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to grab wrong symbol. To reliably reproduce this bug, we need
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to wrap our variable with a bunch of buffers, so that those
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buffers are accessed instead of the real one. */
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int buffer1 = 10;
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int buffer2 = 11;
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int buffer3 = 12;
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int i = 7;
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int buffer4 = 13;
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int buffer5 = 14;
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int buffer6 = 15;
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i++; /* breakpoint inside callee */
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i++;
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}
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void do_at_tests ()
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{
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int x;
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/*: BEGIN: floating :*/
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int i = 10;
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int y = 15;
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/*:
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mi_create_floating_varobj F i "create floating varobj"
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:*/
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i++;
|
|
/*:
|
|
mi_varobj_update F {F} "update F (1)"
|
|
mi_check_varobj_value F 11 "check F (1)"
|
|
:*/
|
|
i++;
|
|
{
|
|
double i = 15;
|
|
/*:
|
|
mi_varobj_update_with_type_change F "double" "0" "update F (2)"
|
|
mi_check_varobj_value F 15 "check F (2)"
|
|
:*/
|
|
i += 2.0;
|
|
}
|
|
{
|
|
float i = 19;
|
|
/*:
|
|
mi_gdb_test "-var-update --all-values F" {.*value="19".*} "update F (--all-values)"
|
|
:*/
|
|
i += 2.0;
|
|
}
|
|
i++;
|
|
/*:
|
|
mi_varobj_update_with_type_change F "int" "0" "update F (3)"
|
|
mi_check_varobj_value F 13 "check F (3)"
|
|
:*/
|
|
i++;
|
|
do_at_tests_callee ();
|
|
i++;
|
|
/*: END: floating :*/
|
|
}
|
|
|
|
/* Some header appear to define uint already, so apply some
|
|
uglification. Note that without uglification, the compile
|
|
does not fail, rather, we don't test what we want because
|
|
something else calls check_typedef on 'uint' already. */
|
|
typedef unsigned int uint_for_mi_testing;
|
|
|
|
struct Data {
|
|
int alloc;
|
|
uint_for_mi_testing sharable : 4;
|
|
};
|
|
|
|
/* Accessing a value of a bitfield whose type is a typed used to
|
|
result in division by zero. See:
|
|
|
|
http://sourceware.org/bugzilla/show_bug.cgi?id=10884
|
|
|
|
This tests for this bug. */
|
|
|
|
void do_bitfield_tests ()
|
|
{
|
|
/*: BEGIN: bitfield :*/
|
|
struct Data d = {0, 3};
|
|
/*:
|
|
mi_create_varobj V d "create varobj for Data"
|
|
mi_list_varobj_children "V" {
|
|
{"V.alloc" "alloc" "0" "int"}
|
|
{"V.sharable" "sharable" "0" "uint_for_mi_testing"}
|
|
} "list children of Data"
|
|
mi_check_varobj_value V.sharable 3 "access bitfield"
|
|
:*/
|
|
return;
|
|
/*: END: bitfield :*/
|
|
}
|
|
|
|
void
|
|
do_anonymous_type_tests (void)
|
|
{
|
|
struct anonymous *anon;
|
|
struct anonymous **ptr;
|
|
struct
|
|
{
|
|
int x;
|
|
struct
|
|
{
|
|
int a;
|
|
};
|
|
struct
|
|
{
|
|
int b;
|
|
};
|
|
} v = {1, {2}, {3}};
|
|
|
|
anon = malloc (sizeof (struct anonymous));
|
|
anon->a = 1;
|
|
anon->b = 2;
|
|
anon->c = (char *) 3;
|
|
anon->d = 4;
|
|
anon->g = '5';
|
|
anon->h = (const char **) 6;
|
|
anon->simple = (simpleton ***) 7;
|
|
|
|
ptr = &anon;
|
|
free (anon);
|
|
return; /* anonymous type tests breakpoint */
|
|
}
|
|
|
|
void
|
|
do_nested_struct_union_tests (void)
|
|
{
|
|
struct s_a
|
|
{
|
|
int a;
|
|
};
|
|
struct s_b
|
|
{
|
|
int b;
|
|
};
|
|
union u_ab
|
|
{
|
|
struct s_a a;
|
|
struct s_b b;
|
|
};
|
|
struct ss
|
|
{
|
|
struct s_a a1;
|
|
struct s_b b1;
|
|
union u_ab u1;
|
|
|
|
/* Anonymous union. */
|
|
union
|
|
{
|
|
struct s_a a2;
|
|
struct s_b b2;
|
|
};
|
|
|
|
union
|
|
{
|
|
struct s_a a3;
|
|
struct s_b b3;
|
|
} u2;
|
|
};
|
|
|
|
typedef struct
|
|
{
|
|
int a;
|
|
} td_s_a;
|
|
|
|
typedef struct
|
|
{
|
|
int b;
|
|
} td_s_b;
|
|
|
|
typedef union
|
|
{
|
|
td_s_a a;
|
|
td_s_b b;
|
|
} td_u_ab;
|
|
|
|
struct ss var;
|
|
struct
|
|
{
|
|
td_u_ab ab;
|
|
} var2;
|
|
|
|
struct ss *ss_ptr;
|
|
|
|
memset (&var, 0, sizeof (var));
|
|
memset (&var2, 0, sizeof (var2));
|
|
ss_ptr = &var;
|
|
|
|
return; /* nested struct union tests breakpoint */
|
|
}
|
|
|
|
int
|
|
main (int argc, char *argv [])
|
|
{
|
|
do_locals_tests ();
|
|
do_block_tests ();
|
|
do_children_tests ();
|
|
do_special_tests ();
|
|
do_frozen_tests ();
|
|
do_at_tests ();
|
|
do_bitfield_tests ();
|
|
do_anonymous_type_tests ();
|
|
do_nested_struct_union_tests ();
|
|
exit (0);
|
|
}
|
|
|
|
|